Excessive reverberation in the chest can be seen in pneumothorax, where the patient has a bulging chest, decreased respiratory motion and fibrillation, excessive reverberation or drumming on percussion, and decreased or absent breath sounds on auscultation. Various kinds of chest trauma are common, including sharp-arm stab wounds and gunshot penetration wounds, rib fracture end misalignment stabbing lung injury, and lung injury during diagnostic and therapeutic medical operations, such as acupuncture puncture lung biopsy, artificial pneumothorax, etc. Secondary pneumothorax is a pneumothorax formed by bronchopulmonary disorders breaking into the chest cavity. Such as chronic bronchitis, pneumoconiosis, bronchial asthma and other obstructive pulmonary disorders, interstitial fibrosis, cellular lung and bronchopulmonary cancer partially occluding the airway to produce alveolar emphysema and pulmonary alveoli, as well as septic pneumonia near the pleura, pulmonary abscess tuberculous cavity, pulmonary fungal disease, congenital pulmonary cysts, etc.. The accumulation of air in the pleural cavity is called pneumothorax. The incidence of traumatic pneumothorax accounts for about 15% to 50% in blunt injuries and 30% to 87.6% in penetrating injuries. The air in the pneumothorax in the majority of cases originates from the lung being punctured by the broken end of the rib fracture (superficially called lung rupture, deep into the fine bronchus called lung laceration), or due to the contusion of the bronchus or lung tissue caused by the action of violence, or the bronchus or lung rupture caused by the rapid increase in pressure in the airway. Pneumothorax can also be caused by sharp or firearm injuries that penetrate the chest wall and injure the lungs, bronchi and trachea or esophagus, and is mostly hemopneumothorax or pneumothorax. Occasionally, closed or penetrating diaphragmatic rupture is accompanied by gastric rupture and causes pneumothorax. Idiopathic pneumothorax refers to no history of respiratory disease, but there can be large alveoli under the pleura, once ruptured to form a pneumothorax is called idiopathic pneumothorax is mostly seen in lean, long-bodied male young adults. Chronic pneumothorax: refers to the pneumothorax after 2 months without full reopening. The reasons for this are: the absorption difficulty of the encapsulated liquid pneumothorax, not easy to heal bronchial negotiation pleural fistula alveoli or congenital bronchial cysts formed by pneumothorax, as well as the airway obstruction or atrophy of the lung connected with the pneumothorax covered with a thicker mechanized envelope to prevent lung reopening.